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You can do it pretty much as for websites (remembering the old good 90s when every website had a graphical visitor counter...)

Create an UIImageView that will be the background (bg.png), and one image for each digits (0.png ... 9.png). Now in interface builder you place four images over the background, initializing them say with 0.png. In your view controller, in turn, you can change the png loaded in the UIImageView, so if the UIImageView of your first digit is called digit1 and you want to set it to 6, you'd use